What is a sandbox?

Sandboxes, a crucial component for securely running untrusted code, are defined by their ability to isolate workloads from their environment, preventing any potential compromises from affecting the host system, other workloads, or tenants. At Northflank, sandboxing is implemented using Kata Containers with Cloud Hypervisor, Firecracker, and gVisor, providing varying levels of isolation. The concept of a sandbox has evolved from being a simple dev scratchpad to a secure runtime environment, especially relevant in the context of AI, where the need to contain code execution has become more pronounced. Different sandbox technologies, including hardened containers, gVisor-backed runtimes, and microVMs, offer varying strengths of isolation boundaries, impacting performance, cost, and scalability. The choice of sandboxing method is influenced by factors such as startup time, resource access, and the specific requirements of the workload, whether it be short-lived code execution or long-running agents. While some believe Kubernetes cannot run proper sandboxes, Northflank demonstrates it is feasible, as evidenced by use cases in high-compliance environments. Sandboxing remains a fundamental part of Northflank's platform, enabling secure execution across diverse cloud environments and supporting the broader software development lifecycle from deployment to disaster recovery.